DE8434367U1 - Closure cap of plastic for pipes - Google Patents

Description

The innovation relates to a cap made of plastic, which the Ends of pipes coated with thermoplastic material, in particular steel pipes, with a substantially cylindrical Coat include. Such caps have long been part of the State of the art. For example, DE-PS 27 28 498 Closure caps made of plastic for coated steel pipes known, j on the one hand to protect against contamination and corrosion of the! Serve Pohrinnenflache. On the other hand, such closure caps are ι also used as coupling elements to the steel pipes during the

Put the coating together into a strand. To do this, the

Closure caps bulges and depressions in such a way that '■ two closure caps each of two tubes lined up next to one another | interlock and thus center the two tubes. To increase | the corrosion protection effect of already coated pipes during the | The sealing caps can be stored on the inside with a | Inhibitor substance, for example in the form of tablets. · In jj bottom of the closure cap coverable Löchsr {air-vent are each below the tube interior is provided. j

PO Since the sealing caps are usually made of polyamide due to the requirement of high temperature resistance (e.g. at least 220 ° C), they are characterized by climatic changes, i.e. especially when exposed to moisture (e.g. rain), by water absorption and the resulting increase in volume ( Sources).

? b This can cause the caps that come with your

cylindrical outer jacket pushed over the ends of the steel tubes |

lose their tight fit on the steel pipe and e.g. under I

atmospheric agents. Such incidents: i

which lead to a loss of corrosion protection can be |

do not completely exclude the fact that the caps are marked with an f

a certain undersize and thereby a particularly J

have a firm fit. I.

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The task of the innovation is therefore to provide a closure cap of the generic type to the effect that the disadvantages mentioned are avoided.

ij, this object is achieved in accordance with renewal characterized in that the surface of the closure cap 1st provided with a water-impermeable coating, which effectively prevents water absorption of the cap and thus your sources. A suitable coating can consist, for example, of a vapor-deposited metal layer. One soi-

However, IQ before treatment of the closure cap is complex and cost-intensive. For the purpose according to the innovation, however, a layer of lacquer is already suitable, which is much cheaper to manufacture. This can for example consist of an epoxy resin varnish. The same effect can also be achieved by coating the - ■> end cap with a plastic that does not tend to absorb water (e.g. polyethylene). As particularly simple and with little A cost-effective measure to be carried out is to coat the closure cap with wax. To improve the anti-corrosive effect, a can on the bottom of the cap on the inside

- ° O inhibitor substance be arranged in a manner known per se.

In addition, the closure cap, if it is used as a coupling cap the pipe coating is to be used, 1n also known s Way be provided with bulges and / or depressions that a f Interlocking of the respective adjacent closure caps enables

• ° 5 borrowed when the individual tubes are pushed together to form a string will.

The coating 1n is advantageously implemented with a layer thickness of 5-10 μm. This is sufficient for effective protection against water absorption. Since the inside of the closure cap \ 1st not directly exposed to the action of moisture, is often sufficient if only the coating of the outer surface of the closure cap. This coating is expediently only applied at the end of the pipe casing before the pipes are stored, so that it is not damaged or destroyed by the temperature influences occurring during the casing (e.g. when using wax).

Example:

A sealing cap made of polyamide with an outer diameter of 220 mm and

65 mm length of the cylindrical jacket has a wall thickness yoi) C «,

1.5 RM. The closure cap was made by VtrspjrOheii _l - ^; Jg ^ i ^ j ^ i ^^ V

cover with an approximately 10 μm thick layer of lacquer. Ayfgru "i ^ id € (r ^{_^;} ^; - ^ ·· '·

Impermeability of the paint layer Modified diet \ ffft0 \ ußrt _r Ü · cap after one year of storage Ie outside under the / WJ $ t * ^ not approximate influences your volume, that does not tend to swell, ^Λ> but retains 1m mounted state your permanent seat on de «

Pipe end.

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Explanation of Figures 1 and 2

Figures 1 and 2 show closure caps according to the invention designed as coupling elements, with 1 the cylindrical jacket, with 2 the coating on the outer surface, with 3 the inhibitor substance, with 4 a bulge, with 5 a depression and finally with 6 the cap base is designated.

Claims (8)

Plastic sealing cap for pipes Protection claims: 1. Closure cap made of a plastic that tends to absorb water, the ends of tubes coated with thermoplastic material with a substantially cylindrical jacket on the outside includes, characterized, that to prevent water absorption, the surface with a waterproof coating is provided. 2. Closure cap according to claim 1, characterized, that the coating is designed as a lacquer layer. 3. Closure cap according to claim 1,
characterized, L ^ that the coating is designed as a plastic coating. - 2 ·· ι r a 9- * 4. Closure cap according to claim 1, characterized in that that the coating is designed as a wax layer. 5. Closure cap according to one of claims 1-4, characterized in that the coating has a thickness of 5-10 µm. 6. Closure cap according to one of claims 1-5, characterized in that that the coating is arranged only on the outer surface. 7. Closure cap according to buckets of claims 1-6, characterized, that an inhibitor substance for the corrosion protection of the pipes is arranged on the inside at the bottom of the closure cap. 8. Closure cap according to one of claims 1 - 7, characterized by bulges and / or depressions in the bottom for use as Coupling cap for pipe coating.